Founded in 1974, Jensen Transformers, Inc., is a manufacturer and developer of high performance audio and video transformers.

Their slogan, "Bringing Science to Sound", is not used lightly. Research and development is performed on-site in a state-of-the-art laboratory.
Jensen Transformers' engineers use some of the most sophisticated computer aided design tools available to develop their line of industry-leading hum and
noise isolation products.

Strict quality controls are maintained over every facet of production from raw materials through final test to ensure that Jensen products are the best
available. Each transformer is rigorously tested both before and after encapsulation.

With inferior products coming from all over the world, we think it is a genuine treasure to find a company like Jensen Transformers, actually designing
and manufacturing some of the finest products in the world, right here in the USA, and we are proud to be able to offer their products.

Same physical specs as the SC-2NR, but the SS-2NR Stereo Speaker to Line Audio Converter is tuned specifically for subwoofer inputs. Terminal strips inputs and RCA output connectors.
(available on the SC-2NR product page)

Similar to the model above except that it can handle two audio channels, the SUB-2RR eliminates sub-woofer hum caused by ground differences
between equipment. Designed specifically for sub-woofer amplifier isolation in Home Theater and Automotive applications

Allows any type of output driver to be connected to either balanced or unbalanced inputs without causing loading or instability problems.
Standard configuration is XLR / XLR, but you may also choose any combination of XLR, RCA, BNC, or Phone connectors.
(formerly DM2-2XX)

This "Pro to Consumer" converter facilitates a proper connection from balanced audio sources to unbalanced audio equipment, while also
providing isolation to eliminate ground loops that can cause hum and noise.

Recommended for most all 2-channel applications where a high-impedance line input, such as the line input of a power amp or crossover
needs to be isolated. XLR input connectors / XLR output connectors.

This ISO-MAX is specially designed for low-frequency applications. It offers common mode rejection of 105 dB at 60 Hz while also
helping to eliminate RF interference...features extended low frequency down to 1 Hz and virtually non-existent distortion for hum-free subwoofer
hookups.

Bare Transformers for DIY - In Stock

Perfect for coupling guitar pickups, musical instruments and other line level outputs to low impedance microphone inputs. Excellent results
when used as an output transformer for tube-type condenser microphones as well.

Same transformer as the item above, but for PB Board mounting. Perfect for coupling guitar pickups, musical instruments and other line level outputs to low impedance microphone inputs. Excellent results
when used as an output transformer for tube-type condenser microphones as well.

With its 4.1 kΩ secondary source impedance, this transformer optimizes noise performance of many IC or discrete amplifiers while
offering an excellent Common Mode Rejection Ratio as well. Threaded Bushing-style Mount and Wire Leads

Additional Models Listed Below are available by "Special Order", although some are now In Stock (as noted)

Audio Isolators - Special Order

Microphone Splitters

The Model MS-8N3 is designed to provide 8 Channels of 3 Way microphone splitting with support for phantom powering. Removable, gold plated
screw terminal connectors provide simple quick, easy installation and service. High density packaging allows many channels in a compact
form factor.

The Model MS-8N2 is designed to provide 8 Channels of 2 Way microphone splitting with support for phantom powering. Removable, gold plated
screw terminal connectors provide simple quick, easy installation and service. High density packaging allows many channels in a compact
form factor.

19" Rack Mounting Panel

Jensen Transformers DIN-MRP • 3RU Rack Panel Mounting Adaptor

3U rack panel accessory for mounting up to 12 modules.

Microphone Input Transformers - Special Order

Microphone Input Transformer Selector Guide

Jensen mic input transformers are legendary for their sonic transparency. All use internal Faraday shielding to virtually eliminate hum, buzz, and RF
interference and are enclosed in MuMETAL® magnetic shielding cans to reduce hum caused by nearby magnetic fields. A range of step-up turns ratios is offered
to optimize noise performance for various input stage designs as are designs with additional shielding. All Jensen Transformers offer extended low-frequency
and Bessel-tailored high-frequency responses, which results in the ultra-low time-domain distortion (DLP) that only Jensen offers. Insertion loss is minimal
and adding phantom power is simple.

Jensen manufactures Microphone Input Transformers in many step-up ratios in order to provide the best possible noise performance with
any type of active amplifier device. All have a 30dB Magnetic Shield can and a single Faraday Shield (except * which have two shields)

Transformer Selection

To determine the proper ratio transformer for your application, you will need to know the Voltage Noise and Current Noise of the active
amplifier device to which the secondary of the transformer will be connected. If you divide the Voltage Noise by the Current Noise of the
device you will get a value in Ohms. This value is the Optimum Source Impedance for best noise performance using that particular amplifier
device. Select the transformer whose secondary impedance most closely matches the calculated value.

Turns ratio is generally selected for lowest total noise. Lowest noise will come from matching the “optimum source impedance” of the
amplifier to the transformer’s “secondary source impedance” – shown in the table above to the right of the colon under “Impedance Ratio.” The
optimum source impedance for any amplifier can be calculated by dividing the amplifier’s voltage noise spectral density in V/ √ Hz ,
such as 1.2 nV/ √ Hz (1.2 nano-volts per root-Hz) by its current noise spectral density in A/ √ Hz , such
as 2 pA/ √ Hz (2 pico-amps per root-Hertz). In this example, using figures for the AD797 low-noise op-amp, the answer is 600 Ω,
making our JT-16A with its 600 Ω source impedance the best choice. This matching is not critical and mismatches of ±50% generally
make less than 1 dB change in total noise. For vacuum tubes, voltage and current noise numbers are difficult to find. However, when they
are available, the calculation will generally indicate an optimum source impedance higher than 15 k Ω. Due to the complex tradeoffs in transformer
design, our JT-115K-E is the highest ratio (and secondary source impedance) we can produce and stay within Jensen performance criteria.
The JT-115K-E gives outstanding results and we recommend it for all vacuum-tube applications.

Example: An AD797 has an input Noise Voltage of 1.2nV per root Hertz Max. @ 1kHz and an input Current Noise of 2.0pA per root Hertz.
This gives an Optimum Source Impedance of 600 Ohms. The proper choice of transformers for this device would be either the JT-16-A or the
JT-16-B.

Special Note for Vacuum Tube Applications

If the above calculation is performed for Vacuum Tubes, the value obtained will normally be much higher than the secondary impedance
of even our JT-115K-E transformer. We do not manufacture Microphone Input Transformers with ratios higher than 1:10 due to the limited bandwidth
that is possible in designs of this type. The JT-115K-E will work very well in most Vacuum Tube applications.

Microphone Bridging / Splitter Transformers - Special Order

Microphone ‘Splitter’ Transformer Selector Guide

These transformers offer not only extended low-frequency and Bessel-tailored high-frequency responses, resulting in ultra-low time-domain
distortion (DLP), but use Jensen-pioneered multiple Faraday shields for unmatched immunity to hum, buzz, and RF interference. These noise problems
can plague systems where distances between signal destinations is large and abnormally high ground-voltage-differences are the norm. Because
they are manufactured on computer-controlled equipment, unit-to-unit consistency is extremely tight. All are enclosed in MuMETAL® magnetic
shielding cans to reduce hum caused by nearby magnetic fields and insertion losses are minimal.

We will eventually list the complete Jensen Transformers product line on this site. Until then, please do not hesitate to
contact us if you don't see the model of interest listed yet.

Line Input and Repeat Coil Transformers - Special Order

Line Input Transformer Selector Guide

For eliminating hum and buzz in line-level signals, Faraday-shielded input transformers are the preferred solution. These transformers offer
extended low-frequency and Bessel-tailored high-frequency responses, resulting in ultra-low time-domain distortion (DLP), and use internal
Faraday shields for unmatched immunity to hum, buzz, and RF interference (high CMRR). Transformer-less inputs suffer “breakthrough” noise in
electrically-hostile environments but transformers are unaffected. The controlled high-frequency response removes ultra-sonic “hard digital
edge” artifacts from signals, resulting in a unmatched sonic clarity. Each transformer is enclosed in a MuMETAL® magnetic shielding can to
reduce hum caused by any nearby magnetic fields. Several turns ratios are offered to optimize noise performance with various input stage designs.
Extremely high dynamic range can be delivered, up to 140 dB, in real-world system environments.

Line Output Transformers - Special Order

Line Output Transformer Selector Guide

Line output transformers are useful mainly because they allow any output stage circuit topology, whether balanced or unbalanced, to drive
any equipment input, whether balanced or unbalanced, without regard to special connection rules or specific cables. Due to the isolation they
afford, hum can be substantially reduced. Jensen output transformers are available in a wide variety of package styles and offer the industry’s
best combination of bandwidth, level handling, and distortion performance. All have extremely low “leakage” (effective series) inductance that
is required to drive very long cables. Various core materials are available based on the source impedance of the driving stage.

Transformer Mounting Styles

Wire Lead – Standard wire termination with retainer clamp

PC Mount – For Direct Soldering to Printed Circuit Board

Load Isolators - for decoupling capacitive loads at high frequencies

We will eventually list the complete Jensen Transformers product line on this site. Until then, please do not hesitate to
contact us if you don't see the model of interest listed yet.

Line Level General Purpose 1:1 Bifilar Output Transformer

Unless otherwise noted, all are multifilar construction with either 50% (“L” types) or 80% (“M” types) nickel cores. Because they have no
Faraday shield, these types are not recommended as input transformers. Characterized below for 0 Ohm source and 600 Ohm load.

Moving Coil Transformers - Special Order

Step-up Transformers (SUT)

Step-up transformers match moving-coil phono cartridges to the inputs of standard pre-amps and receivers. Experience legendary sonic transparency, made possible by Jensen's extended frequency response and time accuracy. Hum and RF interference immunity is ensured by dual magnetic shields as well as Faraday shielding. Models ranging from 3 to 45 Ohms are available, for
compatibility with a wide range of pick-ups.

Notes:

Standard wire-lead termination with retainer clamp

The JT-346-AX is now a 346-AXT to match the 347.

The JT-346-AXT is NOT suitable for a stand alone application. It is designed to be integrated into a moving coil preamp
design and requires a 6.8kOhm load. As it will not work properly into a standard 47kOhm phono preamp.

MSRP: $114.99

Your Price: $103.99

Jensen Transformers JT-34K-DX

1:37 ratio, provides 31 dB of gain for low output cartridges. Ideal for many of the Ortofon cartridges